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ASTM A252 Grade 1 steel pipe pertains to pipe piles with a nominal (average) wall steel cylinder serving as a permanent load-carrying element or as a shell to build case-in-place concrete piles. American Standard ASTM A252 is a pipe piling material standard that is commonly utilized in construction and structural structures.
Surface flaws that are more than 25% of the depth of the nominal wall are termed defects. Welding can be used to fix defects that are less than 22.5 percent of the nominal wall depth. The defect must be entirely eradicated before welding.
| Standard | A252 |
| Specification | Welded Steel Pipe Piles |
| Type | Electric Resistance Welded (ERW) |
| Size | NPS 1 TO NPS 24 [DN25 to DN 600], with nominal average wall thickness as given in ASME B 36.10M or as the customer’s requirement. |
| Outer Diameter | 1-24 inches (33.4-609.6mm) |
| Thickness | 3-12mm |
| Length | Min 3 M, Max18 M, or according to the customer’s requirement. |
| Ends | Small sizes are plain, large sizes are beveled, or according to the customer’s requirement |
| Surface Treatment | Normally bare or black varnish |
| Packaging | Small sizes below 219.1mm in bundles, large sizes in bulk |
| Testing | Chemical Composition, Heat Analysis, Product Analysis, Tensile Requirements, etc. as customer’s requirements. |
The ASTM A252 Grade 1 pipes must be strong enough to withstand the forces specified in the tables below. The yield point is the point at which the material starts to deform permanently under load. It is usually measured by the drop of the beam, by the halt in the gauge of the testing machine, or by other approved methods. If a definite yield point is not exhibited, the yield strength corresponding to a 0.2% offset of the gage length of the specimen, or a 0.5% total extension of the gage length under load, shall be determined instead. These requirements ensure that the material will be able to perform its intended function without deforming excessively under stress.
- Tensile Requirements
- Minimum Elongations
• According to the standard, each length of ASTM A252 Grade 1 pipe pile must be weighted separately. The weight of the pipe pile must not vary more than 15% over or 5% under its theoretical weight, which is calculated using its length and its weight per unit length. If the weight is not specified on the purchase order, it is the responsibility of the manufacturer to ensure that the pipe conforms to the specified calculation formula.
• The outside diameter of pipe piles shall not deviate by more than 1% from the diameter specified.
